Messages in this thread | | | Date | Sat, 22 Nov 2008 19:16:05 +0900 | Subject | Re: [PATCH 03/10] x86: add initialization code for DMA-API debugging | From | FUJITA Tomonori <> |
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On Sat, 22 Nov 2008 10:40:32 +0100 Joerg Roedel <joro@8bytes.org> wrote:
> > > +static int hash_fn(struct dma_debug_entry *entry) > > > +{ > > > + /* > > > + * Hash function is based on the dma address. > > > + * We use bits 20-27 here as the index into the hash > > > + */ > > > + BUG_ON(entry->dev_addr == bad_dma_address); > > > > 'bad_dma_address' is x86 specific. You already found it though. > > Interesting. Is there another value for dma_addr_t which drivers can > check for to find out if a dma-api operation failed?
They are architecture dependent. But only X86 uses a variable because of GART and swiotlb, I think.
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